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In the Define Projection dialog box, choose your input file from the dropdown under Input Dataset or Feature Class. To define the projection, to to ArcToolbox > Projections and Transformations > Define Projection. If we look now at the Layer Properties we see the Coordinate System is. When you add this data, a dialog box will appear warning you about the Unknown Spatial Reference.Īssuming that you know what Coordinate System that is associated with the data, you can define the coordinate system.
#Change coordinate system in arcmap download#
In some cases, the data you download might be missing a projection and you will have to define the projection of the data. We see here that the data was successfully converted to the NAD 1983 New York Long Island State Plane Projection FIPS 3104 Feet Projected Coordinate System. You may be prompted to add the data to your map or you will have to add the data to your map from your output location. Coordinate Systems are composed of both their projections and datums. State Plane) and subfolders containing the Datum (i.e. NOTE: each folder contains the projection (i.e. If you want to project to a coordinate system not already in your map you can similarly find this projection using the Projected Coordinate Systems folder and navigate to your coordinate system of interest. If you already have a layer that contains the projection you would like to use, you can navigate under Layers and find your projection, here the NAD 1983 New York Long Island State Plane Projection FIPS 3104 Feet. Under Output Coordinate System click on the pointer finger to the right to launch the Output Coordinate System wizard. In this case, our input dataset will be the subway routes and we will specify an output location. This will open the Project tool that will allow us to transform our data from one projection to another. Under Data Management Tools go to Projections and Transformations Navigate to ArcToolbox, the red toolbox icon in the menu bar. Projecting Spatial Data from One Projection to Anotherįor this exercise, we will project the subway data that is in GCS_North_American_1983 to the NAD 1983 New York Long Island State Plane Projection FIPS 3104 Feet projection, so that it matches with the rest of the data. ArcGIS uses the projection of the first dataset that you import in the map. While these two datasets are in different Geographic Coordinate Systems, they are previewed correctly in ArcGIS. If we load another file, in this case the subway routes of New York City, we see that they are in a Geographic Coordinate System defined as GCS_North_American_1983. Here you can see information about the Projection, and we see that our datset for the boundry of New York City is in a Geographic Coordinate System defined as NAD 1983 New York Long Island State Plane Projection FIPS 3104 Feet. This is where we can determine the projection of a dataset. Right click on Properties and navigate to the Source tab. *Equidistant Projections - preserve distances to places from one or two points *Conformal Projections - preserve the shape of small features and show directions correctly (i.e.
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#Change coordinate system in arcmap how to#
This tutorial will cover how to project data, how to change coordinate systems, and how to define missing projections in ArcGISĪ data set's projection tells ArcGIS where the data is located on the Planet Earth. Working with Projections and Geographic Coordinate Systems in ArcGIS